Question 1141765
Any regular plane figure's dimensions can be specified, and defined by side length, apothem or radius, and the # of sides.
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Side length is the length of the sides.
Apothem is the distance from the center to any side.
Radius is the distance from the center to any vertex.
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All of us are wrong sometimes.
It's a statement of facts.
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There's no controversy, and math is not a matter of opinion.  We don't vote on it.
The radius of a regular plane figure is the distance from its center to a vertex.